Presence in Virtual Worlds

There have been a lot of experiments conducted to establish how much people feel “present” in virtual words. Loosely, this is usually defined as how much a person reacts to the virtual objects as if they were real (this paper (pdf) gives a good sense of it in its first paragraph). One of my friends in a 3d virtual environment recently wanted to sit on a chair. He’d been so taken in by the quality of the illusion that for a moment he treated the virtual chair as if it actually could support his weight. This is presence, and it’s the zenith of what we aspire to.

Actually, I don’t think it is. I don’t have a nebulous feeling of ‘presence’ in VR, but then I don’t when I’m in a shop, or at work, and sometimes I specifically feel unpresent in the real world. If I’ve been reading a good book, I feel that I’m more in its world than in this one. I think that almost all of these experiments suffer from a way of thinking that almost negates what the experimenters themselves are hoping for. They all start from the assumption that the virtual world is not real, and there’s a difference between it and the real world.

In fact, when I’m in a new environment, real or virtual, I treat it the same. I explore, I try to work out the rules of this new space. I experiment. If I find that the chair in this environment is insubstantial and I can pass my hand right through it, I don’t think that the chair somehow isn’t real, I simply realise that it’s a new kind of real chair, a chair I can’t sit on. I’d be the same in reality if someone gave me an insubstantial chair.

Nobody reacts in a 3d environment as if they are simply being shown patterns of projected colours, just like nobody treats the TV they’re watching Schindlers List on as if it’s just a mesh of colours, or for that matter – nobody treats a book as a bunch of squiggles on sheets. Art is a virtual reality that we explore, experience and decode. In neither simulators nor the walking around world do we experience unfiltered reality. What we experience are the concepts that our environment suggests to us.

There’s no question in my mind that Crayola land, where some of my other friends taunted crudely drawn ducks, or the library, where I was briefly menaced by a ghost child while books flew around are real places. They are just spaces with different rules to spaces I’m used to, and spaces where the assumptions I’m used to don’t always hold. We spend a lot of our lives, particularly when we’re young, working out what is real and what isn’t, and it’s exhilarating to be in that place of possibilities. Reality is a puzzle, and we love to try to solve it.

One of the presence experiments that has been carried out many times is the Pit experiment (pdf). People are asked to conduct a simple task in the virtual environment, and then relatively suddenly are confronted with a huge hole in the floor. Physiological measures show that their heart rate goes up, and their skin conductance changes. Is it Presence? Have people responded to the ‘virtual pit’ in the same way as they would to a ‘real pit’?

The Pit Experiment

I don’t think so, even though when I was there, I nearly lost my balance stepping out over it. (Did me talking about it as if it was really ‘there’ bother you?) I responded to it exactly as I would respond to a real pit – that I knew I couldn’t fall into, but that’s because it was a real pit that I knew I couldn’t fall into. There’s a difference between a ‘real pit’, which contains the notion of something you can fall into and a real pit that you can’t fall into. I’ve jumped out of an airplane, strapped into a parachute, knowing I was completely safe, but that doesn’t mean my heart rate didn’t go up. I responded to it not as I would respond to a real fall, but as I would respond to a real fall where I was safe – a virtual fall.

Of course, it’s difficult to run the experiments to prove this – you’d have to have an insubstantial chair to give me (and how would you carry it?), or run an experiment with a pit that people couldn’t fall into (perhaps using wires?) and compare it with a pit that they really could fall into. It’s difficult to get ethics approval for truly potentially life threatening experiments, even to try to establish a baseline.

And here we find some of the more interesting brand of presence experiments in virtual worlds. Doing experiments virtually that are too unethical to do in the real world. There’s the famous Milgram experiment for example, difficult to get approval for these days, but the virtual version is fine (I think it should be a compulsory part of education to watch the video of some of the 35% of people refusing to give the shocks in the original experiment. It’s inspiring). I saw an experiment where a virtual woman chatted up men, some of whom found her attractive and felt guilty with who knows what effects on the long term health of their relationships. The Millgram experiment is not ethically challenging because of its effect on the actor who is pretending to be shocked, it’s ethically challenging because of its effect on the participants. If people do respond in the same way to the virtual one as they do to the real one, then it’s just as unethical. There is nothing more or less real in the Virtual Milgram experiment than in the “real” one.

In some ways it’s more disturbing. Just like the man in a relationship who wondered if he was a freak because he found himself fancying a virtual woman, it is challenging to our sense of what it means to be human to discover our emotions and cherished empathy responses can be tricked and played so easily. And perhaps this is where the most interesting work is, searching the psyche for what makes us tick, because after all, finding out how we respond to what is inside our own and other peoples heads is even more important than finding out how we respond to various forms of the outside world.

Tales from Soviet times



It was May 1st, International Workers Solidarity Day, and everyone was expected to be part of the celebrations. My Grandfather left the house, and walked down the street. Unusually for May, it was cold and there was snow on the ground. My Grandfather snorted “What the hell kind of a May the first is this?”. He was taken by the KGB. “Someone doesn’t like International Workers Day?”.

The family were horrified, most people never came back once taken. My grandmother was distraught, but eventually at three in the morning, he came back looking white, and without a word went straight to bed. The only thing he said about his interview in the morning, and that only to his closest family was “not all of them there are stupid”.


When my Father was 18, it was the war, and he was in the army, laying communications cable with one other guy younger than him. The sun was shining, the sky was blue and they were laying the cable through beautiful countryside. They were enjoying themselves until they noticed, not far away, two German youths about the same task who had also just noticed them. They both knew that they would be expected to use their weapons, and attack, but instead, they and the Germans gradually moved backwards away from each other until they disappeared into the undergrowth.

Knowing that if it was discovered that they had failed to attack it would mean discipline, and probably execution, they swore never to tell anyone, and until the last year of his life, my father never did tell anyone.


In Soviet times, it was very easy for anyone to get a summer house in the countryside – they were given to anyone who wanted one fairly cheaply, but the size of the plots was very limited, to make sure that nobody got too independent from the state. There were also specific rules about what you were allowed to do with your plot, to make sure that everyone had more or less the same. The KGB would come and check every now and then that the rules were not being flaunted.

In the hot summer, everyone wanted a swimming pool, but one of the rules was that you were not allowed to build a swimming pool on the plot you were allotted. One of our neighbours did anyway. We warned him “You’re bound to be found out, you’ll disappear, you’re risking your life”, and others did too, but to each of us he just smiled and said “I’ll chance it”.

Sure enough eventually, one of his neighbours reported him, and the KGB came round to inspect his plot. Seeing the swimming pool, they said “what’s this?”, and he showed them a recently erected sign; “Extra Water Storage in Case of Fire”. Commending him on his forethought, they left.

Very soon afterwards, everyone in the neighbourhood had extra water storage reservoirs in case of fire. I taught my daughter to swim in one.

These stories are all more or less as told to me recently by my guide in Kazakhstan